Cupola furnace



ug 1927 A. POUMAY CUPQLA FURNACE Filed April 16. 1925 Patented Aug. 23, 1927. UNITED STATES PATENT OFFICE.

ADOLPEE PO'UIAY, JAIBES-LEZ-NAMUB, BELGIUM.

CUIOLA FURNACE.

Application fled April 16, 1925, Serial No. 88,637, and in Belgium Aprli 18, 1884.

My invention relates to cupola furnaces regenerative tuyeres and which are ar and has for its object a construction whereranged in the part of the cupola containing by the consumption of uel is reduced as the charge; the said tuyeres which are compared with such furnaces as hitherto branched on the circular air chamber 3 by constructed. pipes are arranged at different heights Another object of my invention is to obso as to feed the air into the cupola, at tain, in such a cupola furnace, that the cardifferent levels in the charges. In this art, bon monoxide which is produced in the the temperature being little raised an the melting zone may be used for the production coke red hot, the ascending gases are burnt 10 of a combustible mixture which may then under the supply of air, thus preparing the be burnt at a distance above the melting charges which they meet for a rapid meltzone whereby the heat resulting from this. ing in the zone fed by the tuyeres 5. All the combustion is used for the preliminary heattuyeres are provided with regulators 11 or ing of the charges. cocks 12 in order to allow of regulating the With these objects in view, my invention admission of air necessary for the correct essentially consists in a special arrange working of the cupola. The number and ment and combination of sets of tuyeres for cross-section of the different tuyeres must, the air blast as will be hereinafter fully die of course, be proportional to the calculated scribed and pointed out in the appended output of the apparatus. claims. With regard to the special operation of Referring to the annexed drawing: the arrangement thus described, the fol- Fig. 1 is an elevation of a cupola furnace lowing is to be noted: constructed according to my invention. The gases which are produced in a cupola Figs. 2-3 and 4 are, respectively halt sectend always to ascend in the said cupola. tions on the lines 2-2, 3-3 and H in without reaching the centre of the charge Fig. 1. in the melting zone. The tuyeres 5 and 6 The cupola is constructed in the usual are preferably slightly inclined downwardway of a barrel like body 1 of riveted sheet ly so as to retain the gases in the said zone metal having the refractory lining 2 and and to secure the proper action of the blast provided with a circular air chamber 3 011 the whole sectional area of the cupola, which supplies the blast to all the tuyeres at thus producing a great number of calories different levels, t being the inlet thereto. in the time unit. In fact at the level of the According to my invention it is made use tuyeres 5, the combustion takes place with of three sets of tuyeres 5, 6 and 9. production of carbon dioxide but this car- The lower set of tuyeres 5 for meltin are bon dioxide on passing through the ignited made as small as possible in the heigr t of coke, between the tuyeres 5 and the tuyeres their cross-section in order to obtaina melt- 6 is converted into 2 CO. At the level of ing zone of reduced thickness to avoid the the tuyeres 6 a similar operation takes place, oxidation of the various bodies in the metal on account of the air which is fed by the beingtreated. said tuyres, But at this level, the ascending As a consequence of the action of the said gases on meeting the air which is fed diametuyre 5 there is a large production or cartrally by the branches 7 of the tuyeres 6, are hon monoxide in this zone of the cupola.. compelled to follow the direction of the air The second set of tuyeres 6 is arranged and are thus directed towards the centre of at a higher level and at the upper part the cupola. Furtherthe air which is inof the melting zone. These ,tuyeres 6 are jected tangentially through the branches 8, of a much smaller cross-section than the gives to the said gases a gyratory movement tuyeres 5 and each formed with branches preventing the direct ascension of the gases. (see Fig.2) 7 and 8, the branch 7 being .di- Further owing to the proportion of air rected towards the centre of the cupola which is injected at the level of the tu ere whilst the branch 8 is tangential thereto, 6, a mixture of air and carbon monoxi e'is whereby a gyratory movement is imparted formed. This mixture is then burnt and to the air jets assuring a vigorous mixing the carbon monoxide is gradually converted thereof with the gas ascending in the cupola. in carbon dioxide at the different levels of The third set of tuyres 9 comprises a the regenerative tuyeres 9. The heat which number of tuyeres which may be called the is thus produced prepares the charges in such a manner that when the said charges reach the melting zone, they can be'melted 'of the furnace, a second set of tuyeres arranged at a hi her level, the said tuyeres comprising two ranches, one of which is directed towards the center of the furnace and the other tangentially thereto and a third set of W eres spirally arranged around the cupola w ereby air is fed by the tuyeres of the third set at relatively different levels throughout a furnace area from the air chamber to that part of the furnace containing the charge. 20

2. In a cupola furnace, a barrel-like body,

an uyilper part of the said body containing the c arges to be treated and a lower part forming a melting zone, an air chamber surrounding the furnace at the level of the said melting zone, a lower set of downwardly inclined tuyeres arranged towards the centre of the furnace, a second set of downwardl inclined tuyeres arranged at a higher leve the said tn eres com rising two branches one of which is directe towards the centre of the furnace and the other tangentially there to and a third set of tuyeres spirally arranged around the cupola whereby air is fed by the tuyeres 'of the third set at relatively different levels throughout a furnace area from the air chamber to that part of the furnace containing the charge.

In testimony whereof I have afiixed my signature.

ADOLP-HE POUMAY. 

